Pictorial representation on a transparent carrier



F. KRON ER Oct. 19, 1937.

PICTORIAL REPRESENTATION ON A TRANSPARENT CARRIER File'd Ndv. 4, 193a UNITED- STATES PATENT oi-FICE rrcronur. naraesmarrox on a PARENT Omit Friedrich Kroner, Berlin -(lhariottenburg asignor to 'lransart many. borg, Sweden TRANS- Ger- I Akflebolltr 7 Application November 4, 1936, Serial No. 169,143

A In Germany November "I, 1935 representation or image sheet and a process for producing the same.

It is the object of this invention to apply'picever, with such a ground layer it is notpossible to look at the picture from both sides while this possibility is very desirable for many purposes. v

According to the present invention, two individual pictures or pictorial representations are tures on a transparent carrier insuch a'manner applied to the carrier in such a manner that one that-both sides of the carrier carry or show a of the two pictures will be-visible when one face I picture, giving the impression of a perfectly transof the carrier sheet is viewed while the other picparent picture or carrier layer, while the picture turewill be visible when the other face of the itself is unaffected by any coloured surface or carrier sheet is'viewed, the two individual picbackground which may be located behind or beturesbeing so superposed or arranged on the car- 10 low the picture; in other words, it is the object rier that their outer contours coincide; withinof my invention to eliminate the mixing efiect" these outer contours the two pictures are optically which will be noted when a transparent picture, separated from each other by at least one intersuch as a lantern slide, is placed on any surface mediate layer which either alone or in combinaor in' front of a background which is riot of a 'tion with the pictures forms an opaque portion 15 plain neutral colour, while the transparent nature of .the carrier sheet. I of. the carrier sheet with its inherent advantages It is thus possible to produce pictures on transis preserved. parent material which meet the requirement of Another object of this invention is to present being visible from either side, permit the use of two different pictures when looking upon the half tints, shadings or hali-tonesgand at the same carrier sheet from either side thereof, preserving, time are not impaired by any objects lying behind however, the-impression 0! a transparent carrier the picture in' the viewing direction. layer or picture. Y The surprising effect of an image sheet 01' this When the term "picture", pictorial representakind resides in the fact that the observer will have tion or image" is used throughout the specificathe impression that the front and back picture aretion and claims, the term is understood to comidentical while the two pictures are actually sepaprise any kind of a visible representation in the rate-or independent representations which moreform of a photograph, drawing, diagram, shaded over may be diflerent as to the subject matter, or coloured picture or whatever kind of repreobjects or .articles they show. Due to the cosentation of any object, matter or article of a inciding contours of the two pictures and the physical or other nature. g transparency of the portions of thecarrier which The "carrier layer used in connection with the --are outside these contours the illusion is created present invention may be any suitable transparthat one and the same picture is visible on both ent sheet material which is preferably very thin {sides while actually two vdiiierent pictures will be and flexible. -For instance sheets of cellulose seen when either side of the carrier is viewed. derivatives may be used which are similar to According to this invention, the opaque interpaper, but at the same time absolutely clear and mediate layer may be applied by the printing of transparent like clear glass, such material some-, a body or "covering layer on the carrier surtimes being referred to as cellulose-glass" or face having a neutral, more particularly a white glass-cellulose." Other materials, such as the colour, or' a colour which is common to the two 40 so-called Cellophane", *Cellon or Celluloid, opposing pictures. regenerated cellulose, cellulose hydrate or the like, According to a special feature of my invention may also. be used. the two pictorial representations and the'neutral Normally, ii a picture is printed on any of these intermediate layer may be applied to the same transparent sheets, the picture will be visible from 1 surface of the transparent picture carrier in such 4 both sides, but at the same time the picture itself a way that the picture which is to be visible is also transparent, so that the objects behind the from the .back is first applied on this surface picture will influence the colour etc., of the picby any suitable printing or other process, then ture, unless the sheet is placed on a plain white the opaque or neutral intermediate layer is apsupport or bottom layer. plied and finally the picture which is to be visible Now, thisdrawback may be obviated by applyfrom the front-side is printed onto the opaque ing a prime or ground colour on the transparent intermediate layer. By printing the said second carrier layer underneath the picture, for inpicture on the opaque layer I create the'illusion stance inthe form of a white "body" l'ayer. How- 015 a transparent picture although the two pictures may be different as to their subject matter.

' a material consisting of cellulose which is treated My-invention will be better understood by reference to the accompanying drawing showing by way of example and diagrammatically some embodiments of the invention. of course, it will be understood that various modifications of these embodiments may be made according to the practical requirements, without a departure from the scopeof my invention. Fig. 1 is a schematic cross-section through one form of my novel combination which is produced by both sides of the carrier sheet being printed on;

Fig. 2 is a schematic cross-section through a modified form which isalso produced by both sides of the carrier sheet being printed on, and- Fig. 3 is a schematic cross section through a third form which can beproduced by all the layers being printed onto the carrier sheet from i one side thereof.

In the drawing,- l is the picture carrier which may consist of'a glass-like cellulose material, 1. e.,

in a special manner so as to form a transparent sheet material which is clear like glass. In all embodiments of my invention which are illustrated, two separate pictures are produced within the same or coinciding contours, the representation or picture 2 being visible on the back or bottom side and the-representation or picture3 being visible on the front or top side of the carrier sheet I.

A plurality colour layers 4, 5 and 6 may be applied forproducing colours-which are true to nature including all gradual shadings or half-tones. It is not necessary that the number of the colour layers for the top side picture is the same as that for the bottom side picture.

Any suitable printing or other reproduction process may be used for applying the pictures or colour layers to the carrier, such as for example the colour printing process, lithographic or lithochromatic processes, processes using etched metal plates or the like with recessed, projecting or roughened surfaces for carrying the colour.

According to Fig. 1 .a substantially opaque ground or body layer 1 is applied to either face of the transparent sheet I, within the contours of the picture or pictures, before the pictures are applied. I have found that it is not necessary for this ground layer 1 to be absolutely opaque,

but the'body or covering power should be of such degree or intensity that no mixing" effect will be noticeable, in other words, that no portions of the back picture will be visible when the frontpicture is viewed and vice versa. This may be effected in a simple manner for instance by the printing of a covering layer onto the transparent sheet, before the picture is produced which will appear in the finished article on the respective side of the transparent sheet. This covering layer may'be of a white or any other neutral colour or of a colour which is prevailing in one or both of the pictures or images.

It will be understood that a similar opaque layer I may be appliedto the bottom or back side of the transparent carrier sheet before the backside picture is applied: thus I may attain a very intensive covering power of this bottom print, or v I may make the covering power of the two covering layers so small that they will only by their combined eflect give the desired resultas to the opaqueness of the whole unit.

I may use different colours or colour tones for the two covering layers I, and each of the two aoca eo of colour layers, for instance three layers I may be adapted or selected in accordance with the respective picture to be applied thereon. Any suitable process may be used for applying these neutral separating layers 1. For example in the embodiments shown in the drawing the requisite covering effect may be attained by a suitable mechanicalor chemical treatment of the transparent carrier within the contours of the pictures, for instance by a roughening of the surface of the carrier sheet. Again, I may use a carrier sheet which is originally opaque and the portions thereof outside the contours of the pictures may be rendered transparent like glass, preferably'after the pictures have been applied, by any suitable treatment.

If the colour layers of the images are partly opaque per so, I mayrestrict the application 'of the additional opaque separating layers to those for instance to the top side, by means of ordinary or colour printing, this image I being intended to be visible from the bottom side of the carrier sheet which in this case is not printed. Hereafter the separating or covering layer I, for

instance being in the form of a layer of neutral,

e. g., white colour is applied to this image layer 2, for instance by printing, this separating layer in turnbeing provided with the picture 3 which may be printed thereon in one or several colours and is visible on that side of the carrier which in this case actually-carries both im-.

. portions of the picture which are not sufiiciently ages, including the opaque intermediate layer. 1

It will be understood that in' this case all the steps for applying both pictures will take place on the same side of the carrier whether the pictures are applied in the normal manner by printing or by any other, manual or artistic, method.

This. results in a considerable simplification and saving of material both as regards the'technical manufacturing process and the tools and machines which are required, since as similar cliches may be used for printing both images, a smaller number of colouring devices is required etc. For example, in the embodiment shown in Fig. 3, only four colouring devices are required for producing half-tone or gradually shaded pictures instead of the seven colouring devices which are required for producing thesheet shown in Fig. 1 and the eight colouring devices which are required for producing the sheet shown in Fig. 2. I claim: 1. The combination with a thin sheet of transparent material, of two coinciding images having the same contour applied to said sheet, and at least one opaque layer of like contour intermediate said images. v

2. The combination with a thin sheet of' transparent material, of' an opaque layer and a superposed image on each side of said sheet-said opaque layers and images coinciding with each of said sheet, an opaque layer superposed on said opaque layer, said two images and said opaque layer having the same contour.

4. The combination with a-thin sheet of transparent material, of an image applied to each side of said. carrier, both images coinciding and having the same contour, and an opaque portion in said sheet of like contour as said two images and coinciding therewith.

5. The combination with a thin sheet of transparent material, of two images applied to said sheet in coinciding relationship and having the same contour, and a means rendering the sheet between said images opaque within the same contour. a

6. A process for producing image carrying sheets of transparent'material, comprising applying to the sheet in coinciding relationship two. images having the same contour and at least one opaque layer of like contour intermediate said images, thereby making each of said images visible separately from the other image.

'7. A process for producing image carrying sheets of transparent material, comprising successively applying to one side oi! the sheet in coinciding relationship first an image, then an opaque layer and finally a second image, said images and said opaque layer having the same contour.

8. A process'for producing image carrying sheets of transparent material, comprising applying to each side of the sheet in coinciding relationship an opaque layer and superposing thereon an image, said opaque, layers and said images having the same contour.

9. A process for producing image carrying sheets of transparent material, comprising rendering a portion of the sheet opaque and then applying to each side of the sheet in coinciding relationship with said opaque portion an image, said images and said opaque portion having the same contour.

10. The combination with a thin sheet of transparent material,- of same contour applied to said sheet, and at least two coinciding images of the one intermediate opaque layer of like contour being a color which is present in at least one of said two images.

. FRIEDRICH KRONER. 

